package com.hm.reggie.controller;

import com.hm.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;


import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

/**
 * 文件上传和下载
 */
@RestController
@RequestMapping("/common")
@Slf4j
public class CommonController {

    @Value("${reggie.path}")
    private String filepath;

    @PostMapping("/upload")
    public R<String> upload(MultipartFile file){
        log.info("============"+file.toString());
        //原始文件名称
        String originalFilename = file.getOriginalFilename();
        //用uuid修改文件名
        String newfilename = UUID.randomUUID().toString()+originalFilename.substring(originalFilename.lastIndexOf("."));
        //判断目录是否存在
        File dir= new File(filepath);
        if (!dir.exists()){
            dir.mkdir();
        }

        try {
            file.transferTo(new File(filepath+newfilename));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(newfilename);
    }

    //文件下载
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){

        try {
            //输入流，通过输入流读取文件
            FileInputStream fileInputStream = new FileInputStream(new File(filepath + name));
            //输出流，把数据写回浏览器
            ServletOutputStream outputStream = response.getOutputStream();

            response.setContentType("image/jpeg");
            int len = 0;
            byte[] bytes = new byte[1024];
            while((len = fileInputStream.read(bytes)) != -1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }

            //关闭流
            fileInputStream.close();
            outputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}
